https://bugs.webkit.org/show_bug.cgi?id=76855

https://bugs.webkit.org/show_bug.cgi?id=76855
Implement a JIT-code aware sampling profiler for JSC

Reviewed by Oliver Hunt.

Add support to MetaAllocator.cpp to track all live handles in a map,
allowing lookup based on any address within the allocation.

* wtf/MetaAllocator.cpp:
(WTF::MetaAllocatorTracker::notify):
(WTF::MetaAllocatorTracker::release):
    - Track live handle objects in a map.
(WTF::MetaAllocator::release):
    - Removed support for handles with null m_allocator (no longer used).
    - Notify the tracker of handles being released.
(WTF::MetaAllocatorHandle::~MetaAllocatorHandle):
    - Moved functionality out into MetaAllocator::release.
(WTF::MetaAllocatorHandle::shrink):
    - Removed support for handles with null m_allocator (no longer used).
(WTF::MetaAllocator::MetaAllocator):
    - Initialize m_tracker.
(WTF::MetaAllocator::allocate):
    - Notify the tracker of new allocations.
* wtf/MetaAllocator.h:
(WTF::MetaAllocatorTracker::find):
    - Lookup a MetaAllocatorHandle based on an address inside the allocation.
(WTF::MetaAllocator::trackAllocations):
    - Register a callback object to track allocation state.
* wtf/MetaAllocatorHandle.h:
    - Remove unused createSelfManagedHandle/constructor.
(WTF::MetaAllocatorHandle::key):
    - Added, for use in RedBlackTree.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105841 268f45cc-cd09-0410-ab3c-d52691b4dbfc